“If there’s no progress, why am I here?”

Mavens looked unhappy, uncomfortable, somehow out of place. He had lost the brave youthful certainty Bobby remembered about him. “Because I have time on my hands, all of a sudden. I’m not suspended, in case you’re thinking that. Call it a sabbatical. One of my old cases has been under review.” He eyed Bobby. “And.”

“What?”

“I want you to see what your WormCam is really doing to us. Just one time, one example. You remember the Wilson murder?”

“Wilson?”

“New York City, a couple of years ago. A young teenager from Bangladesh — he’d been orphaned by the floods in ’33.”

“I remember.”

“The UN placement agency found this particular relocate, called Mian Sharif, an adoptive home in New York. A middle-aged, childless couple who’d taken one adopted kid before — a girl, Barbara — and brought her up successfully. Apparently.

“The story looked simple. Mian is killed at home. Mutilated, before and after death, apparently raped. The father was the prime suspect.” He grimaced. “Family members always are.

“I worked on the case. The forensics were ambiguous, and Wilson’s mind maps showed no particular propensity to violence, sexual or otherwise. But we had enough to convict the man. Philip George Wilson was executed by lethal injection on November 27, 2034.”

“But now…”

“Because of the demand on WormCam time for new and unresolved cases, the review of closed cases like Wilson has been a low priority. But now the public have gotten online to the WormCams, they are looking for themselves, and they are starting to agitate for some old cases to be reopened: friends, family, even the convicted themselves.”

“And now the Wilson case.”

“Yeah.” Mavens smiled thinly. “Maybe you can understand how I’m feeling. You see, before the WormCam, I could never be sure what the truth is in any given case. No witness is a hundred percent reliable. The perps know how to lie through forensics. I couldn’t know what happened, unless I was there.

“Wilson was the first convicted criminal to be executed because of my work. I knew I’d done the best I could to establish the truth. But now, years after the event, I’ve been able to see Wilson’s alleged crime for the first time. And I found out the truth about the man I sent to the needle.”

“Are you sure you ought to show me.”

“It will be in the public domain soon enough.” Mavens twisted the SoftScreen around so Bobby could see, and began to dial up a recording.

The ’Screen cleared to show a bedroom. There was a wide bed, a wardrobe and cupboards, animated posters of rock and sports stars and movie icons on the wall. A boy lay face down on the bed: slim, dressed in T-shirt and Jeans, he was propped up on his elbows over books and a primary-colour SoftScreen, sucking a pencil. He was dark, his hair a rich black mass.

Bobby said, “That’s Mian?”

“Yeah. Bright kid, lived quietly, worked hard. He’s doing his homework. Shakespeare, as it happens. Aged thirteen, though I guess he looks a little younger. Well, he won’t get any older… Tell me if you want to stop this.”

Bobby nodded, curtly, resolved to see this through. This was a test, he thought. A test of his new humanity.

The door opened outward, admitting a burly middle-aged man. “Here comes the father. Philip George Wilson.” Wilson was carrying a soda bottle; he opened it and set it down on a bedside table. The boy looked around and said a few words.

Mavens said, “We know what they said. What are you working on, what time does Mom get home, blah blah. Nothing consequential; just an ordinary exchange.”

Wilson ruffled the boy’s hair and left the room. Mian smoothed back his hair and went back to work.

Mavens froze the image; the boy turned to a statue, his image flickering slightly.

“Let me tell you what we thought happened next — as we reconstructed it back in ’34.

“Wilson comes back into the room. He makes some kind of pass at the boy. The boy rebuffs him. So Wilson attacks him. Maybe the boy fights back; if so, he didn’t do Wilson any damage. Wilson has a knife — which, incidentally, we don’t find. He cuts and rips at the kid’s clothes. He mutilates him. After he kills the boy, by cutting his throat, he may have performed sex on the body, or he may have masturbated; we find flecks of Wilson’s semen on the body.

“And then, cradling the body, covered in blood, he yells 911 at the Search Engine.”

“You’re kidding.”

Mavens shrugged. “People act in strange ways. The facts are that there was no way in or out of the apartment save for locked windows and doors, none of which were forced. The hallway security cams showed nothing.

“We had no suspects save for Wilson, and a lot of evidence against him. He never denied what he did. I think maybe he believed himself that he really had done it, even though he had no memory of it.

“Our experts were split. We have psychoanalysts who say Wilson’s knowledge of his appalling act was too much for his ego to bear. So he repressed it, came out of the episode, returned to something like normal. Then we have cynics who say he’s lying, that he knew exactly what he was doing; when he realized he couldn’t get away with the crime, he feigned mental problems to secure a softer sentence. And we have neurologists who say he probably suffers from a form of epilepsy.”

Bobby prompted, “But now we have the truth.”

“Yes. Now, the truth.” Mavens tapped the SoftScreen, and the recording resumed.

There was an air-conditioning grille in the corner of the bedroom. It popped open. The boy, Mian, got to his feet quickly, looking startled, and backed into a corner.

“He didn’t call out at this point,” Mavens said softly. “If he had…”

Now a figure crawled out through the open grille. It was a girl, dressed in a tight-fitting spandex ski suit. She looked sixteen, might have been older. She was holding a knife.

Mavens froze the image again Bobby frowned. “Who the hell is that?”

“The Wilsons’ first adopted daughter. She’s called Barbara — you remember I mentioned her. Here she was eighteen years old, and she’d been living away from home a couple of years.”

“But she still had the security code to get into the building.”

“Yeah. She came in disguise. Then she got into the air ducts, big fat ones in a building that age. And that’s how she got into the apartment.

“We used the ’Cam to track her back a couple of years deeper into the past. Turns out her relationship with her father was a little more complex than anyone had known.

“They got on fine when she lived at home. After she left for college, she had a couple of bad experiences. She wanted to come home. The parents talked it over, but encouraged her to stay away, to become independent. Maybe they were wrong to do that, maybe they were right. But they meant well.

“She came home anyway, one night when the mother was away. She crawled in bed with her sleeping father, and performed oral sex on him. She was the initiator. But he didn’t stop her. Afterwards he was full of guilt. The boy, Mian, was asleep in the next room.”

“So they had a row.”

“No. Wilson was distressed, ashamed, but tried to remain sensible. He sent her back to college, talking about putting this behind them, it’s a one-off. Maybe he really thought time would heal the wounds. Well, he was wrong.

“What he didn’t understand was Barbara’s jealousy. She’d become convinced that Mian had displaced her in her parents’ affections, and that was the reason she was shut out, kept away from home.”

“Right. So she tries to seduce the father, to find another way back…”

“Not exactly.” Mavens hit the SoftScreen, and the little drama began to unfold once more.

Mian, recognizing his adoptive sister, got over his shock and stepped forward.

But with startling speed Barbara closed on him. She elbowed him in the throat, leaving him clutching his neck, gasping.